May I suggest a different approach, which goes with the normal rules and is in fact a bit more ralistic? In-Game XP Spending. Tell your players, they may attempt any force power during game, if they have the XP to buy it. That would represent such a force-epiphany nicely imo.
So basically you give all force powers for free, and adjust the FP requirement for every effect?Force users can attempt any Force power and depending on what they want to do there is a cost of FP that must be met.
Yep.
I don't really want to use the force power trees. I want to keep it light and simple.
Like in the old WEG? Believe me down that road lies nitpicky discussions with players till no end. The trees are the first really good force-leraning rule I have seen in over 16 years as a Star Wars GM. The rules are set and the player can read and see what he can do. No stupid discussion ensues, no stalling of the game, no aggravated co-players.
Seriously it happened several times with different players. Led to me banning force powers altogether, because it was so vague.